Please help with some simple HTML Form code

Hmm, well it had a syntax error on this line:

Email: ".$_POST['email']

Somthing about an unexpected "

So I removed it and have changed the code to this:

<?php
if(!$visitormail == "" && (!strstr($visitormail,"@") || !

strstr($visitormail,".")))
{
echo "<h2>Please use the Back button and enter a valid e-mail 

address.</h2>\n";
}
if(empty($visitormail)) {
echo "<h2>Please use the Back button and enter an e-mail 

address.</h2>\n";
}

$todayis = date("l, F j, Y, g:i a") ;

$attn = $attn ;
$subject = "Newsletter request";

$notes = stripcslashes($notes);

$message = " $todayis [EST] \n
Attention: $attn \n
Message: $notes \n
From: $visitor ($visitormail)\n
Additional Info : IP = $ip \n
Browser Info: $httpagent \n
Referral : $httpref \n
";

$from = "From: $visitormail\r\n";


mail("info@...", $subject, $message, $from);

?>

Now when I run it it always reports "Please use the Back button and enter an e-mail address" so basically it thinks visitormail is empty. I've changed the news.php page so that the form has this <input type='text' name='visitormail' size='40'> but it doesn't seem to work. Any ideas where I'm going wrong? Thanks.